Pulverized-fuel burner



L. H. BERGMAN PULVERIZED FUEL BURNER Filed Jan. '2'. 1920 2 Shegts-Sheet 1 IE f Berg marl.

' L. H. BERGMAN PULVERIZED FUEL BURNER Filed Jan. '7 .1 2 Sheets- 8mm 2 more fuei implies-tier;

To T7 whom may common 11 M Be it snows shot 1, ZJARQ c ciiizen of she United Stores, he ci of Chicago, Cook and Sim of Hiinos, certain now and usoioi ?1 ii'veriy/ed-1 uei Burners; i declare i the foiiowin, and or ct description of the sa being had to the occoinp 1 refroin marked w i d o resideno,

ooun'ty oi have invented rovenicnts in do n.

and to the numerals. G1. thereon which form a per; of unis specification. This invention reieios to ilulvcrizeo. iiuei burners of the type in which puiverized. fuoi. is fed into a stream sir biown into the furnace chamber.

With the burners of ihis kind considerable trouble has been etr tpericnocd iii-producing u uniform mixture of powdered fuoi with the air, purtiouiuriy when the burner is or ranged horizonisiiy. If fuel is fed into a horizontal pipe through which air is blown, the upper'peri; oi the current or air receives than. she iowor This may be avoided by providing a frusso-couiczii sieove or projection on ono part of the pipe which cazi'ies'bi air and then feeding powdered fuoi onto this cone so that it may fell thereoroundvand be fed into the current or" air around its pcriphew. It has found, how-ever that with oiov: veioci'ty of air such an am'ongemonb tends "to iced more powdered fuel into the lower part ti'ian into the upper part of the air current. On ihe wither hand with a high velocity of air the reverse occurs. I

@116 of she objects. thereforo of the present invention is to provide means for varying the location of the various parks of t burner so as .iw to provide suhshn'ntiniiy uniform mixing of the air and powdered fuel "for the particular vciooiiy oi cznpio ed.

A further object of the invention is to vary the point at which the "fuel. is discharged onto the frustoconicel end of she air pipe so as to vary the operation of the device to suitthe varying veiocities.

A further object of the invention is to provide means for adjusting; the specs through which *che powdered i'u-ei is fed into no air currei Qther and further impcrtont obicots of nvc ition Wiii be from. the sures 111 the drawings and SPBCifiCiL- he invention (in a preferred form) is iiiustrated in the drawings and hereinafter more fully described.

{in iiho drawingsi igure 1 is o. side elevation. of a burner constructed. in amordance with the yrosent inven'tio iiigure is a vortioul central section through the some.

Figure 3 is a, section. on the ii.no'2=;-3 of Figure 2.

Figure 4. Figure 2.

Figure 5 Figure 3. v

Figure (Sis a side elevation pariaiy in section of a fuifiher form of construction.

As shown on the drawings The hurneris shown with its forwardor discharge eyid projecting into an aperture 1 in the wall 2 of a furnace of any desired form and construction. The burner it seif consists of a substantialiy horizontal conduit comprising a. discharge nozzle 3 in the rear end 3 of which is siidebly mounted the forward end 4- of an angle pipe 5. This angle pipe 5 is connected through a pipe 6 to is convenient, source of air under pressure. On the upper side of the pipe 3 is integral" iymounied on extension 7 through which powdered fuel may be fed from a pipe 8 leading to a hopper or other source of powdered fuel. The forward end 4 of the angle pipe is reduced in size end given a tapered formto provide a frusto-oonicai and 9 which is spaced away from the adjacent Wadi oi the pipe 3. As this frustoconical end is immediatelyboiow the bore of the extension 7., powdered fuel passing down the iatter sills onto this frusto-conica end and uutomsticaiiy distribubes itseif, para; over the upper edge of the member 9, and the rest around izhe some, and discharges into the air current at points thcreoround. The stream of air passing through the pipe 5 is split up into me concentric streams by means of a short length or pipe 10 concentric "with and secured to the and 4 of the pipe 5. With such on arrangement the air which passes around the outside of who i section on the line 55 of is section on the iine H of I particles and to inject it intothe furnace, while the air which passes through the pipe i supplies the necessary extra oxygen required for the complete combustion of the fuel Within the furnace. For this reason I call the air around the outside of pipe fuel separating and conveying air, While the air inside of pipe 10 may be called coinbustion air. As previously indicated, it the air velocity is high, the suction produced by the How of air causes-the powdered fuel to be drawn into the upper part of the atomising stream to a much greater extent than H the air is only moved atthe lower part. slowly, the reverse action occurs, and consequently it is advisable to cause powdered fuel to fall nearer the edge of the trusteconical end 9 when the velocity is lower than when the velocity is high. This adjustment of the point of discharge of the powdered tuel may he brought about in one or both of two ways: first, by means of a suitable deflector in the extension T; second, by adjustingthe axial positions of the memher 9 with respect to the pipe 3. These two forms of adjustment are shown in the drawings. The deflector may conveniently take the form of a chute ll provided with side Wings 12. This chute is secured to a shaft 13 having" secured thereto at one end a handie 14 by which the deflector may be ad justed. The deflector is, preferably, supported in its adjusted position by means of a screw 15 adapted to be locked in any desired position by means of a lock nut 16.

The parts 3 and 5 of the device are provided With apertured lugs 17 and 18 for the passage of clamping" screws 19 therethrough. Means are also provided for restrictinp the extent to which the forward end i of the anglepipe 5 may he moved into the rear end 3 of the pipe 3 by means of the clamping bolts 19. For this purpose adjusting screws 20 are provided in the lugs 18 and the ends of these screws are adapted to engage with the rear end of the pipe 3 and thereby restrict axial movement of the forward end a of the pipe 5 within the pipe 3. in this Way the position of the frusto-conical end 9 with respect to the aperture in the extension Y may be adjusted as desired.

In order that the operation of the burner may be observed. a sight glass 21 may he provided. The sight glass is mounted in a frame 22pivotally mounted at- 23 on the membor 5 so that it may he swung out of the Way when it is desired to clean the burner. The free end of this frame 22may' conveniently be provided with a fork 22% adapted to pass over a lug 25 through which a cotter p n 26 may he passed to retain the frame portion, a fuel supply pipe. a connection stones tapermay even be entirely with to!" coarsely powdered fuel W air pressure necessaryv therefore illustrated in Fig. 6 at if z: nozzle and tube "Witl'iout any am aware that numerous details of construction be varied. through a Wi e range Without departing from the prurciples of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

1 claim as my invention 1. In a pulverized fuel burner, a tubular conduit, a i'rusto-conical portion coins: from the Wall of said conduit, prz-ijcctoward the discharge end thereof, and marking a space between said wall and s tween said' fuel pipe and said deinur .ff space, means for varying the distrihuti on fuel in said space, a pipe Within slid to lar conduit and afiording'a passage bet it and the wall of said conduit for fuel for airto separate the .tuel particles and convey the same, the passage through said pipe serving for combustion 2. A burner for pulverized fuel. compriaingan approximately horizontal tubul conduit, a tapering tubular partition with '1 said conduit and between the ends the the smaller end of said partition sip arated from the wall of said conduit whereby a space is provided between said and said partition and opening into conduit. a substantially vertical delivering" fuel into said space and a l deflector in said "pipe for varying; the poi. otdischarge of fuel Zlrfihhurner for pulverized fuel, (f)l1']i')1'l!' ing' a tubular conduit including two sections, one of which sections is prov with a tapered end projecting; into one end ii of the other section and provici between said tapered end and said other section, means for 7 into said space, means extending i space for distributing the fuel means for connecting}; the pipe section a in said tapered end with source under p essure, and clamp ng; mea s clamping said sections to ether and L "wall of supply pipe terminating in a tapered portion, and means in the fuel feed pipe acting in conjunction with said tapered portion for adjusting the amount of fuel de- 6. A burner for powdered fueL comprising a conduit, means associated therewith to provide a fuel space having a discharge orince concentric to and communicating with the passage through said conduit, means for supplying fuel to said space, and

.adjustable means extending into said space to distribute the fuel therein, whereby a substantially uniform discharge of fuel is ,efiected throughout the entire area of said dischar e orifice.

7. A urner for powdered fuel, comprising a conduit, means associated therewith to provide a'fuel space having a discharge orifice concentric to and communicating with the passe. e through said conduit, means for suppdying fuel to said space, means for connecting said conduit with a source of air under pressure and means for maintaining a substantially uniform discharge of fuel throughout the entire area ofsaid discharge orifice comprising a member movable in said space to distribute the fuel therein.

8. A burner for powdered fuel, comprising a cond it, means associated therewith to rovide a el space having a discharge orice 'concentric to and communicating with the passage through said conduit, means for.

flector extending into said space to vary the distribution of fuel therein.

9. A burner for powdered fuel, comprising a conduit, a flange projecting inward and forwardly from the wall of said conduit and providing a fuel space having a discharge orifice concentric to and communicating with the passage through said conduit, means for supplying fuel to saidspace, and means for maintaining a substantially uniform discharge of fuel throughout the entire area of said discharge orifice comprising a deflector embracing a portion of said. flange and movable in said space to vary the distribution of fuel therein. a

10. A burner for pulverized fuel, comprising a conduit for air under pressure, a pipe arranged within said conduit and spaced from the walls thereof to form inner and outer concentric passages, said conduit being provided with a fuel space having a discharge orifice concentric to 'and communirating with said outer passage at a point intermediate the ends of said pipe whereby the air passing through the said outer passage is mixed with fuel and whereby air only passes through said inner passage, and adjustable means for distributing the fuel in said fuel space with relation to said discharge orifice to insure a substantially uniform discharge of fuel throughout the entire area of said discharge orifice.

11. A burner for powdered fuel comprising a conduit provided with a portion spaced from the wall thereof and defining a fuel space, means for supplying fuel to said fuel space, means for connecting said conduit with a source of air under pressure, and meansextending into said space for distributing the fuel therein. v

In testimony whereof I have hereunto subscribed my name in thepresence of two subscribing witnesses.

' LABS HUGO BERGMAN.

Witnesses:

RIDSDALE ELLIS, EARL M. HARDINE. 

